feat: add initial api lookup endpoint for entities with test

[akhilesh26]

BB API

Run this initial setup for BB API.
Install dependencies using npm install
To check the endpoint, run the project without docker with npm run start-api.
Endpoints implemented:
http://localhost:9098/work/<bbid>
http://localhost:9098/work/<bbid>/aliases
http://localhost:9098/work/<bbid>/identifiers

To run the test for this endpoint use npm test ./test/src/api/routes/test-work.js

[coveralls]

Coverage increased (+2.3%) to 42.914% when pulling 704e2a3 on akhilesh26:api into 3d5119c on bookbrainz:master.

[akhilesh26]

The test will not pass because data is not pushed into bookbeainz_test. To pass the test, replace
database bookbrainz in place of bookbraiz_test in test.json file.

[MonkeyDo]

OK, that's a good start!

Structure-wise, we will want to separate the website server and the API, meaning having the API be a separate Express server.
You'll want to copy src/server/app.js and see what you need to keep in that file to have an express server running. You will also want to copy /routes.js and keep only your new endpoints.

Finally, you can add a new section to config.json and config.example.json (and test.json) for the API; all the properties I can think of right now are port and versionPrefix: '/v1/', that you will then be able to use in your code where appropriate.

[akhilesh26]

@MonkeyDo, Please check it once again, mainly setup related things. I will try to complete the first-week work in this weekend.

[akhilesh26]

@MonkeyDo Insertion of data in the test database is creating some problem on running the test, please check it.

[MonkeyDo]

I've added a few comments of lines in the new api/app.js that are not useful for the API.
Also check for unused imports once they're deleted.